The ALARA principle and the regulatory radiation protection requirements for nuclear power plant workers as well as the public impose restrictive limits on effective doses for the protection of the two categories. Other requirements have been set for the protection of the environment.
ASCOMP is well-aware of such requirements at the national and international level and provides services at the needed level of detail in the following technical areas, for both normal operation and under accident conditions:
Radiation Source Term Generation
The Radionuclide Inventory can be evaluated for the reactor core or for the fuel pool (or any other source such as fuel transport or storage casks).
Dispersion and Dose Assessment
Atmospheric dispersion evaluations are typicallyrequired by the authorities for normal operation and under accident conditions, see also Probabilistic Safety Assessment Level 2 and Level 3. The water and ground dispersions constitute other pathways for the dispersion of the radionuclides. The latter pathways have minor or make no contributionsin to the releases under normal operation of the plant. However, they need to be analyzed at the stage of site evaluation and characterization, and need to be monitored throughout the plant operation and evaluated for the extreme accident conditions that may lead to direct releases through these pathways.
Radiation Protection Program
A detailed radiation protection program is needed to ensure fulfilling the ALARA principle and regulatory requirements concerning the occupational doses and the doses that may be received by public. The instrumentation and monitoring program should also be an integrated part of the radiation protection program. In the development of such programs, ASCOMP will take into account the Principles of ALARA and radiation protection, ICRP recommendations and those of the IAEA (requirements, guidelines and standards). Furthermore national regulations and requirements (such as those of the Swiss ENSI, the US 10CFR, STUK etc.) are fully addressed in the program.
The background radioactivity is characterized at the stage of site evaluation and monitored throughout the life-cycle of a plant. Both on-site and sampling for laboratory evaluations are required for such activities. Similarly, construction of tunnels and dams requires background radioactivity evaluations and a Radiation Protection Program, especially when high concentrations of primordial isotopes are foreseen. The Background Radioactivity Assessment may be planned by ASCOMP and performed by authorized laboratories. A Radiation Protection Program could also be developed for protection of the workers and supervised by ASCOMP at the site.